alternative for FindWindow

The solution above with the window class name (or a part of it) wont work for me, because the app i search for is a vb6 program and those have all the same window class name 'ThunderRT6FormDC'. So this class name leads not to a unique program.

Is there a way to have an enhanced FindWindow function which works with only a part of the window title? The window title of my program consists of a known and a unknown part, so the classic FindWindow function (which needs the exact window title) wont work.

Greets,
M.